Paid for blog to showing up on Explorer browser & error box on sidebar I need to

I paid for a domain to go with my Word Press Blog. It is http://swflfreemarketvolunteers.com. My problem is that it is not working for the explorer browser. Is there something that needs to be done? In addition, I tried to add the Facebook button on the sidebar of my blog and must have added an incorrect link. Every since I have a box that appears that says: "Could not retrieve id for the specified page. Please verify correct href was passed in." Also under the box is just blank space although I have added several more widgets to the sidebar. How can I get rid of the box and resolve this matter? Your help is very much appreciated!

Jennifer,
Thank you for your help! I still don't know how to get rid of the error box in the sidebar. It was fine until I tried to post a widget with the facebook logo on my sidebar. I must have used the wrong link and now I can't get rid of it. This is all new to me. Thanks again!